diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-qup.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index 73a288068632..d16361df1bfb 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -219,9 +219,24 @@ static irqreturn_t qup_i2c_interrupt(int irq, void *dev) if (bus_err) writel(bus_err, qup->base + QUP_I2C_STATUS); + /* + * Check for BAM mode and returns if already error has come for current + * transfer. In Error case, sometimes, QUP generates more than one + * interrupt. + */ + if (qup->use_dma && (qup->qup_err || qup->bus_err)) + return IRQ_HANDLED; + /* Reset the QUP State in case of error */ if (qup_err || bus_err) { - writel(QUP_RESET_STATE, qup->base + QUP_STATE); + /* + * Don’t reset the QUP state in case of BAM mode. The BAM + * flush operation needs to be scheduled in transfer function + * which will clear the remaining schedule descriptors in BAM + * HW FIFO and generates the BAM interrupt. + */ + if (!qup->use_dma) + writel(QUP_RESET_STATE, qup->base + QUP_STATE); goto done; } @@ -847,20 +862,12 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg, goto desc_err; } - if (rx_cnt) - writel(QUP_BAM_INPUT_EOT, - qup->base + QUP_OUT_FIFO_BASE); - - writel(QUP_BAM_FLUSH_STOP, qup->base + QUP_OUT_FIFO_BASE); - qup_i2c_flush(qup); /* wait for remaining interrupts to occur */ if (!wait_for_completion_timeout(&qup->xfer, HZ)) dev_err(qup->dev, "flush timed out\n"); - qup_i2c_rel_dma(qup); - ret = (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO; } |